Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method in a wireless network, the method comprising: spreading data with a spreading sequence at a first device to generate multi-carrier spread data on subcarriers corresponding to non-zero subcarrier elements of the spreading sequence, the spreading sequence having sparsity of non-zero subcarrier elements and an equal spacing between adjacent non-zero subcarrier elements; and transmitting the multi-carrier spread data to a second device over a communication channel, wherein the spreading sequence is selected from a plurality of spreading sequences, each spreading sequence of the plurality having a respective equal spacing between adjacent non-zero subcarrier elements, the spreading sequences of the plurality differing from one another in at least one of: sparsity level in a frequency domain, the sparsity level corresponding to a repetition level in a time domain; and sparsity pattern in the frequency domain, the sparsity pattern being manifested as non-zero subcarrier element collision in the frequency domain, at least two of the spreading sequences of the plurality of spreading sequences having different sparsity levels in the frequency domain.
2. The method of claim 1 , wherein spreading data with a spreading sequence to generate multi-carrier spread data comprises spreading each of a plurality of data symbols with a respective spreading sequence from the plurality of spreading sequences.
3. The method of claim 1 , wherein at least one non-zero subcarrier element in the spreading sequence used for spreading the data collides with one non-zero subcarrier element of at least one other spreading sequence in the plurality of spreading sequences, and at least one other non-zero subcarrier element in the spreading sequence used for spreading the data is different from one non-zero subcarrier element of at least one other spreading sequence in the plurality of spreading sequences.
4. The method of claim 1 , wherein the spreading sequence has a length corresponding to a number of subcarriers available in the wireless network.
A wireless communication system uses spreading sequences to enhance signal transmission by distributing data across multiple subcarriers. The invention improves this by generating a spreading sequence with a length that matches the number of available subcarriers in the network. This ensures efficient use of the frequency spectrum, reducing interference and improving data transmission reliability. The spreading sequence is designed to cover all subcarriers, allowing for optimal signal spreading and reception. The method involves selecting a sequence length that aligns with the network's subcarrier count, which may vary depending on the network configuration or standards. By dynamically adjusting the sequence length, the system adapts to different network conditions, maintaining performance across varying subcarrier allocations. This approach enhances spectral efficiency and minimizes signal distortion, particularly in dense or high-interference environments. The invention is applicable to wireless networks using orthogonal frequency-division multiplexing (OFDM) or similar multi-carrier modulation techniques, where precise subcarrier utilization is critical for reliable communication. The spreading sequence may be generated using mathematical algorithms or pre-defined patterns that ensure uniform distribution across all available subcarriers, further improving signal integrity and reducing errors.
5. The method of claim 1 , wherein a value of the non-zero subcarrier elements in the spreading sequence is equal to 1.
This invention relates to wireless communication systems, specifically to techniques for generating and using spreading sequences in orthogonal frequency-division multiplexing (OFDM) or similar multicarrier modulation schemes. The problem addressed is the efficient design of spreading sequences to improve signal transmission reliability and spectral efficiency in wireless networks. The invention describes a method for generating a spreading sequence where non-zero subcarrier elements are assigned a value of 1. This spreading sequence is applied to data symbols in a multicarrier system, such as OFDM, to spread the data across multiple subcarriers. The spreading process helps mitigate interference, improve robustness against fading, and enhance signal detection at the receiver. By setting non-zero subcarrier elements to 1, the method simplifies the spreading operation while maintaining orthogonality between different sequences, which is critical for multi-user or multi-antenna systems. The spreading sequence is generated by selecting a subset of subcarriers from a larger set of available subcarriers, where the selected subcarriers are assigned a value of 1 and the remaining subcarriers are set to 0. This binary assignment ensures that the spreading sequence has a constant amplitude, which simplifies power amplification and reduces distortion in the transmitted signal. The method may be used in various wireless communication standards, including 5G, Wi-Fi, or other systems employing multicarrier modulation. The invention improves spectral efficiency and reliability by optimizing the spreading sequence design while maintaining compatibility with existing communication protocols.
6. The method of claim 1 , wherein the number of non-zero subcarrier elements in the spreading sequence is greater than 2.
7. The method of claim 1 , wherein the spreading sequence used for spreading the data at the first device is a first spreading sequence, the plurality of spreading sequences comprising at least one spreading sequence having a different number of non-zero subcarrier elements than the first spreading sequence.
8. The method of claim 1 , wherein the spreading sequence used for spreading the data at the first device is a first spreading sequence, the plurality of spreading sequences comprising at least one spreading sequence having a different sparsity level and a different length than the first spreading sequence.
This invention relates to wireless communication systems, specifically to methods for spreading data using multiple spreading sequences with varying sparsity levels and lengths. The problem addressed is the need for flexible and efficient data spreading techniques that can adapt to different communication conditions and requirements. The method involves using a first spreading sequence to spread data at a first device. The spreading sequences used are part of a set that includes at least one sequence with a different sparsity level and a different length than the first sequence. Sparsity level refers to the proportion of non-zero elements in the sequence, while length refers to the total number of elements. By varying these parameters, the system can optimize performance based on factors such as interference resistance, bandwidth efficiency, and computational complexity. The method allows for dynamic selection of spreading sequences to suit specific communication scenarios. For example, a higher sparsity level may be chosen to reduce interference in dense networks, while a longer sequence may be used to improve signal resolution in high-noise environments. The flexibility in sequence design enables better adaptation to varying channel conditions and user demands, enhancing overall system performance.
9. The method of claim 1 , wherein the spreading sequence used for spreading data at the first device is selected from a first device-specific partial subset of the plurality of spreading sequences configured for the first device.
10. The method of claim 1 , wherein the spreading sequence used for spreading data at the first device has a different sparsity level and a different length than a spreading sequence selected for a third device from the plurality of spreading sequences to use for spreading data in the wireless network.
This invention relates to wireless communication systems, specifically methods for spreading data using sequences with varying sparsity levels and lengths. The problem addressed is the need for efficient and flexible data spreading in wireless networks to improve performance and reduce interference. The invention provides a method where a first device uses a spreading sequence with a specific sparsity level and length to spread its data. Another device, referred to as a third device, uses a different spreading sequence from the same set of available sequences, where this second sequence has a different sparsity level and length compared to the first. Sparsity level refers to the proportion of non-zero elements in the sequence, while length refers to the total number of elements. By assigning different sequences with varying sparsity and length to different devices, the system can optimize data transmission, reduce collisions, and enhance overall network efficiency. The method ensures that devices in the network use distinct spreading sequences, minimizing interference and improving signal integrity. This approach is particularly useful in dense wireless environments where multiple devices must coexist without significant performance degradation. The invention focuses on dynamically selecting and assigning spreading sequences to devices based on their specific requirements, ensuring robust and efficient communication.
11. The method of claim 1 , wherein the sparsity in the frequency domain corresponds to pulse repetition in the time domain.
This invention relates to signal processing techniques for analyzing sparse signals, particularly in radar or communication systems where signals exhibit periodic or pulsed characteristics. The method addresses the challenge of efficiently representing and processing signals that have sparse frequency-domain characteristics, which correspond to pulse repetition in the time domain. By leveraging sparsity, the technique enables improved signal reconstruction, detection, or compression. The method involves transforming a time-domain signal into the frequency domain, where the sparsity is identified. This sparsity arises from the periodic or pulsed nature of the signal, meaning only a few frequency components are significant. The technique then processes these sparse frequency components to reconstruct, detect, or compress the signal more efficiently than traditional methods that do not exploit sparsity. This approach reduces computational complexity and improves accuracy in applications like radar target detection, wireless communications, or signal compression. The method may include steps such as applying a Fourier transform to convert the time-domain signal into the frequency domain, identifying the sparse frequency components, and then using these components to reconstruct the signal or extract relevant information. The sparsity in the frequency domain directly correlates with the pulse repetition intervals in the time domain, allowing for efficient processing of signals with periodic structures. This technique is particularly useful in scenarios where signals are inherently sparse, such as in radar systems with pulsed transmissions or communication systems with bursty data.
12. The method of claim 1 , wherein the spacing between adjacent non-zero subcarrier elements in the at least two sequences is constant and the at least two spreading sequences provide single carrier Peak-to-Average Power Ratio (PAPR).
13. The method of claim 1 , wherein each sparsity pattern is corresponding to a codebook, and the codebook comprises multiple spreading sequences that are generated from different phase rotations in the frequency domain by assigning the non-zero subcarrier elements of spreading sequence values corresponding to column values of a rotated Discrete Fourier Transform (R-DFT) matrices.
This invention relates to wireless communication systems, specifically methods for generating and using sparsity patterns in signal transmission to improve efficiency and performance. The problem addressed is the need for efficient signal representation and transmission in systems where resources are limited, such as in massive MIMO or millimeter-wave communications. The method involves generating sparsity patterns, each corresponding to a codebook. Each codebook contains multiple spreading sequences derived from phase rotations in the frequency domain. These spreading sequences are created by assigning non-zero subcarrier elements based on column values of rotated Discrete Fourier Transform (R-DFT) matrices. The R-DFT matrices provide a structured way to generate orthogonal or near-orthogonal sequences, which are useful for reducing interference and improving signal detection in multi-user or multi-antenna systems. The use of R-DFT matrices ensures that the spreading sequences maintain desirable properties such as low peak-to-average power ratio (PAPR) and good correlation characteristics. By rotating the DFT matrix, different sets of sequences can be generated, allowing for flexibility in adapting to varying channel conditions or user requirements. This approach is particularly useful in scenarios where beamforming or precoding is employed to enhance signal quality. The invention improves upon prior art by providing a systematic way to generate and utilize sparsity patterns, leading to more efficient resource allocation and better system performance. The method is applicable in various wireless communication standards, including 5G and beyond, where efficient signal transmission is critical.
14. The method of claim 1 , wherein non-zero subcarrier element values are based on column values of rotated Discrete Fourier Transform (R-DFT) matrices and the resulting spreading sequences that share a common sparsity pattern have different pulse offsets in the time domain.
15. A transmitter device comprising: a spreader configured to spread data with a spreading sequence to generate multi-carrier spread data on subcarriers corresponding to non-zero subcarrier elements of the spreading sequence, the spreading sequence having sparsity of non-zero subcarrier elements and an equal spacing between adjacent non-zero subcarrier elements; and a transmitter configured to transmit the multi-carrier spread data, wherein the spreading sequence is selected from a plurality of spreading sequences, each spreading sequence of the plurality having a respective equal spacing between adjacent non-zero subcarrier elements, the spreading sequences of the plurality differing from one another in at least one of: sparsity level in a frequency domain, the sparsity level corresponding to a repetition level in a time domain; and sparsity pattern in the frequency domain, the sparsity pattern being manifested as non-zero subcarrier element collision in the frequency domain, at least two of the spreading sequences of the plurality of spreading sequences having different sparsity levels in the frequency domain.
16. The transmitter device of claim 15 , wherein the spreader is configured such that at least one non-zero subcarrier element in the spreading sequence used for spreading the data collides with one non-zero subcarrier element of at least one other spreading sequence in the plurality of spreading sequences, and at least one other non-zero subcarrier element in the spreading sequence used for spreading the data is different from one non-zero subcarrier element of at least one other spreading sequence in the plurality of spreading sequences.
The invention relates to wireless communication systems, specifically to transmitter devices that use spreading sequences for data transmission. The problem addressed is improving spectral efficiency and reducing interference in multi-user communication environments where multiple devices share the same frequency resources. The transmitter device includes a spreader that applies a spreading sequence to data before transmission. The spreading sequence is designed such that at least one non-zero subcarrier element in the sequence overlaps (collides) with a non-zero subcarrier element from at least one other spreading sequence used by another device. However, the spreading sequence also includes at least one non-zero subcarrier element that does not overlap with any non-zero subcarrier element in the other spreading sequences. This partial overlap ensures that while some interference occurs, the data remains distinguishable due to the unique subcarrier elements in each sequence. The transmitter device may also include a modulator that converts the spread data into a modulated signal for transmission, and an antenna for emitting the signal. The spreading sequences are part of a set of sequences, each assigned to different devices to enable simultaneous transmission without complete orthogonality. The partial collision design balances interference reduction with spectral efficiency, allowing more users to share the same frequency band while maintaining acceptable signal integrity. This approach is particularly useful in dense wireless networks where orthogonal spreading sequences are impractical due to limited resources.
17. The transmitter device of claim 15 , wherein the spreader is configured such that the spreading sequence has a length corresponding to a number of subcarriers available in the wireless network.
18. The transmitter device of claim 15 , wherein a value of the non-zero subcarrier elements in the spreading sequence is equal to 1.
19. The transmitter device of claim 15 , wherein the number of non-zero subcarrier elements in the spreading sequence is greater than 2.
This invention relates to wireless communication systems, specifically to transmitter devices that use spreading sequences for signal transmission. The problem addressed is the need for efficient and flexible signal spreading techniques to improve communication reliability and performance in wireless networks. The transmitter device generates a spreading sequence with a configurable number of non-zero subcarrier elements, where the number of non-zero subcarriers is greater than two. This allows for more flexible signal modulation and better utilization of available frequency resources. The spreading sequence is applied to data symbols before transmission, enhancing robustness against interference and multipath fading. The device includes a processor that generates the spreading sequence based on predefined rules or parameters, ensuring compatibility with different communication standards and protocols. The transmitter also includes a modulator that applies the spreading sequence to the data symbols, and an antenna for transmitting the modulated signal. The use of multiple non-zero subcarriers improves spectral efficiency and reduces the likelihood of signal degradation in noisy environments. This technique is particularly useful in systems requiring high data rates and reliable communication, such as 5G and beyond-5G networks. The invention provides a way to dynamically adjust the spreading sequence to adapt to varying channel conditions, optimizing performance without requiring significant hardware changes.
20. A communication device configured to send data to a wireless network, the communication device comprising the transmitter device of claim 15 .
21. The transmitter device of claim 15 , wherein the spreading sequence used for spreading the data at the transmitter device is a first spreading sequence, the plurality of spreading sequences comprising at least one spreading sequence having a different number of non-zero subcarrier elements than the first spreading sequence.
22. The transmitter device of claim 15 , wherein the spreading sequence used for spreading the data at the transmitter device is a first spreading sequence, the plurality of spreading sequences comprising at least one spreading sequence having a different sparsity level and a different length than the first spreading sequence.
This invention relates to wireless communication systems, specifically to transmitter devices that use spreading sequences to encode data for transmission. The problem addressed is the need for flexible and efficient data spreading techniques that can adapt to varying channel conditions and system requirements. The transmitter device generates a data signal by spreading input data using a spreading sequence. The spreading sequence is part of a set of available sequences, where at least one sequence in the set has a different sparsity level (i.e., the proportion of non-zero elements) and a different length compared to the sequence used for the current transmission. This allows the system to dynamically select spreading sequences based on factors such as interference levels, bandwidth constraints, or data rate requirements. The transmitter may also adjust the spreading sequence in response to feedback from a receiver or based on predefined criteria. The invention improves communication reliability and efficiency by enabling adaptive spreading, which can reduce interference, optimize bandwidth usage, and enhance signal robustness. The use of multiple spreading sequences with varying sparsity and length provides flexibility in balancing these trade-offs. The transmitter may also include components for generating, storing, or selecting these sequences, as well as for modulating and transmitting the spread signal. The system may operate in various wireless communication environments, including those with time-varying channels or multiple users.
23. The transmitter device of claim 15 , wherein the spreading sequence used for spreading data at the transmitter device is selected from a first device-specific partial subset of the plurality of spreading sequences configured for the transmitter device.
24. The transmitter device of claim 15 , wherein the spreading sequence used for spreading data at the transmitter device has a different sparsity level and a different length than a spreading sequence selected for another transmitter device from the plurality of spreading sequences to use for spreading data.
25. The transmitter device of claim 15 , wherein the sparsity in the frequency domain corresponds to pulse repetition in the time domain.
26. The transmitter device of claim 15 , wherein the spacing between adjacent non-zero subcarrier elements in the at least two sequences is constant and the at least two spreading sequences provide single carrier Peak-to-Average Power Ratio (PAPR).
27. The transmitter device of claim 15 , wherein each sparsity pattern is corresponding to a codebook, and the codebook comprises multiple spreading sequences that are generated from different phase rotations in the frequency domain by assigning the non-zero subcarrier elements of spreading sequence values corresponding to column values of rotated Discrete Fourier Transform (R-DFT) matrices.
28. The transmitter device of claim 15 , wherein non-zero subcarrier element values are based on column values of rotated Discrete Fourier Transform (R-DFT) matrices and the resulting spreading sequences that share a common sparsity pattern have different pulse offsets in the time domain.
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February 9, 2021
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